Deck 25: Heredity

Question 1

In autosomal recessive disorders,what happens to children who inherit one copy of the allele?

A) The disorder manifests itself.
B) They become carriers of the disorder.
C) They are unaffected by the disorder.
D) Any of the above is possible.

Answer 1

B

Question 2

When two alleles for the same trait are both expressed,you know that

A) both alleles are recessive.
B) one allele is dominant.
C) the alleles are codominant.
D) the alleles are heterozygous.

Answer 2

C

Question 3

Which of the following is most likely to produce a mutation in genetic material?

A) Smoking
B) High-fat diet
C) Vitamin deficiency
D) Exposure to certain chemicals

Answer 3

D

Question 4

How is gender determined?

A) Through environmental variables
B) By the presence or absence of certain chromosomes
C) By the mother's body temperature at the time of fertilization
D) By the timing of fertilization

Question 5

When one parent passes on a dominant defective allele,what chance does the child have of manifesting the disorder?

A) A 100 percent chance
B) A 75 percent chance
C) A 50 percent chance
D) A 25 percent chance

Question 6

A complete set of genetic information for one person is called a

A) gene.
B) genome.
C) autosome.
D) chromosome.

Question 7

Which statement about sex-linked disorders is correct?

A) A female who inherits an allele for a sex-linked disorder will develop Turner syndrome.
B) A female who inherits an allele for a sex-linked disorder will never express any symptoms.
C) A male who inherits an allele for a sex-linked disorder will always express the disorder.
D) A male who inherits an allele for a sex-linked disorder will express the disorder only if he has a matching allele for the disorder.

Question 8

Klinefelter syndrome,which becomes apparent at puberty when secondary sexual characteristics fail to develop,results from

A) nondisjunction of autosomal chromosomes.
B) nondisjunction of sex chromosomes.
C) disjunction of autosomal chromosomes.
D) disjunction of sex chromosomes.

Question 9

Which statement about female gametes is correct?

A) Female gametes contain a single X chromosome.
B) Female gametes contain two X chromosomes.
C) Female gametes may contain either an X or a Y chromosome.
D) Female gametes contain both an X and a Y chromosome.

Question 10

A person who has two different alleles for the same trait is said to be what?

A) Heterozygous for the trait
B) Homozygous for the trait
C) Homologous for the trait
D) Autosomal for the trait

Question 11

What do you know about a person who has a recessive allele for a particular trait but who does not show that trait?

A) He or she is heterozygous for that trait.
B) His or her alleles are codominant.
C) Two recessive alleles are present.
D) A gene mutation has occurred.

Question 12

In general,what happens when an allele for brown eyes is paired with an allele for blue eyes?

A) The offspring will be heterozygous for the trait and have brown eyes.
B) The offspring will be homozygous for the trait and have blue eyes.
C) The offspring will be heterozygous for the trait and have blue eyes.
D) The offspring will be homozygous for the trait and have brown eyes.

Question 13

Why does the locus of each gene not vary from person to person?

A) So that the genes supplied by the egg can align with the similar genes supplied by the sperm
B) To prevent gene mutation
C) So that fertilization can occur and produce offspring with equal genes from both parents
D) So that a person's gender can be determined

Question 14

What disorder resulting from nondisjunction of sex chromosomes causes a syndrome whose characteristics include a webbed neck and short stature?

A) Klinefelter syndrome
B) Cystic fibrosis
C) Huntington's disease
D) Turner syndrome

Question 15

Which statement about nondisjunction is correct?

A) Nondisjunction occurs when a pair of chromosomes separates during meiosis.
B) The most common cause of nondisjunction is a permanent change in genetic material.
C) Color blindness is a common disorder resulting from nondisjunction.
D) Nondisjunction results in one daughter cell lacking a particular chromosome.

Question 16

A person who has two alleles that are the same is said to be what?

A) Heterozygous for the trait
B) Homozygous for the trait
C) Homologous for the trait
D) Autosomal for the trait

Question 17

Which of the following occur in equal pairs in both males and females but do not play a role in determination of gender?

A) Genomes
B) Chromosomes
C) Alleles
D) Autosomes